Pipe coupling



FIG. 1 is an isometric view of our design for a pipe coupling;

FIG. 2 is a front view of the design for the pipe coupling shown in FIG. 1, the rear view being identical;

FIG. 3 is a top view of the design for the pipe coupling shown in FIG. 1;

FIG. 4 is a bottom view of the design for the pipe coupling shown in FIG. 1; and,

FIG. 5 is a left side view of the design for the pipe coupling shown in FIG. 1, the right side view being identical.

The broken line showing of portions of the pipe coupling in FIGS. 1–5 forms no part of the claimed design. 

We claim the ornamental design for a pipe coupling, as shown and described. 